CN203722508U - Off-grid photovoltaic inverter suitable for impact loads - Google Patents
Off-grid photovoltaic inverter suitable for impact loads Download PDFInfo
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- CN203722508U CN203722508U CN201420071517.5U CN201420071517U CN203722508U CN 203722508 U CN203722508 U CN 203722508U CN 201420071517 U CN201420071517 U CN 201420071517U CN 203722508 U CN203722508 U CN 203722508U
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- 239000003990 capacitor Substances 0.000 claims abstract description 18
- 230000001939 inductive effect Effects 0.000 claims description 5
- 238000010248 power generation Methods 0.000 abstract description 3
- 230000003750 conditioning effect Effects 0.000 abstract 2
- 125000004122 cyclic group Chemical group 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 239000013598 vector Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses an off-grid photovoltaic inverter suitable for impact loads, and pertains to the technical field of photovoltaic power generation. The main objective of the utility model is to solve the problem that a conventional off-grid photovoltaic inverter cannot be used in fluctuating load (the average value is less than the direct-current side power, and the peak value is greater than the direct-current side power) situations due to insufficient direct-current side power. The off-grid photovoltaic inverter is mainly characterized in that the off-grid photovoltaic inverter comprises a direct-current support capacitor, an inverter bridge, an alternating-current filter inductor circuit, an alternating-current filter capacitor circuit and an alternating-current load switch which are connected successively; a direct-current super capacitor circuit is connected in parallel on two ends of the direct-current support capacitor; the off-grid photovoltaic inverter further comprises a voltage and current conditioning circuit, a digital signal processor and a drive circuit which are connected successively, the input end of the voltage and current conditioning circuit is connected with the input end of the alternating-current load switch, and the output end of the drive circuit is connected with the control end of the inverter bridge. The off-grid photovoltaic inverter of the utility model can be used to supply power to impact loads of users to ensure the normal operation of this kind of loads (such as the motor reloading starting moment).
Description
Technical field
The utility model belongs to photovoltaic power generation technology field, be specifically related to a kind of be applicable to impact load from net type photovoltaic DC-to-AC converter.When the power peak that load occurs in short-term or periodicity is larger, also can guarantee AC stable output, thereby guarantee that user stablizes electricity consumption.
Background technology
Solar power generation is initially direct current form, after photovoltaic DC-to-AC converter, is converted to alternating current for user.In pure off-grid photovoltaic generating system, due to not main electrical network, system only has single photovoltaic energy, and user load is completely by powering from net type photovoltaic DC-to-AC converter, and now the output stability of photovoltaic DC-to-AC converter is most important.
User load has multiple pattern, for some impact loads (such as motor): its power average is less, but starts instantaneous power greatly, power there will be periodically larger peak value after even running.Traditional does not have energy storage device from net type photovoltaic DC-to-AC converter, when DC side power is less than bearing power peak value, causes that DC voltage sharply reduces, and occurs undesired power supply, causes periodic shutdown even to damage load.
Summary of the invention
The utility model, for the deficiencies in the prior art, is improving in net type photovoltaic DC-to-AC converter main circuit and control system, provide a kind of and can export in short-term relatively high power, be applicable to impact load from net type photovoltaic DC-to-AC converter.
For achieving the above object, the technical solution adopted in the utility model is: a kind of be applicable to impact load from net type photovoltaic DC-to-AC converter, comprise the DC support electric capacity, inverter bridge, ac filter inductive circuit, ac filter condenser network, the AC load switch that connect successively, it is characterized in that: a direct current super capacitor circuit in parallel at described DC support electric capacity two ends; Also comprise the electric current and voltage modulate circuit, digital signal processor, the drive circuit that connect successively, the input of electric current and voltage modulate circuit is connected with the input of AC load switch, and the output of drive circuit is connected with the control end of inverter bridge.
DC support condenser network described in the technical solution of the utility model is greater than the super capacitor of 1 farad by capacitance and forms.
The utility model increases direct current super capacitor circuit in DC side, makes DC side possess energy storage effect.Correction and Control system, when bearing power is larger, makes direct current super capacitor circuit discharge power demand is provided rapidly simultaneously; When load is steady, give the charging of direct current super capacitor circuit, simultaneously, electric current and voltage modulate circuit collects signal, is sent to digital signal processor and carries out computing, produces control signal, through drive circuit, be used for controlling inverter bridge, photovoltaic module is carried out to maximal power tracing (MPPT).
Prior art, when starting heavily loaded motor, there will be motor not start; In bearing power in short-term or when periodically larger, can cause that inverter protection shuts down.For tackling the larger problem of this bearing power in short-term, need at present extra a large amount of photovoltaic modulies of installing, not only expensive, when load does not steadily need this part power, cause again huge waste.
The utility model has the following advantages compared to existing technology: (1) does not change from the main circuit topology of net type inverter, only increases DC support capacitance; (2) adopt unique output voltage control method, for voltage harmonic, do special control, improve harmonic wave of output voltage.
Accompanying drawing explanation
Fig. 1 is from net type photovoltaic generating system figure.
Fig. 2 is that the utility model is from the circuit diagram of net type photovoltaic DC-to-AC converter.
Fig. 3 is control algolithm block diagram.
In figure: photovoltaic module 1, inverter 2, user load 3, direct current super capacitor circuit 4, DC support electric capacity 5, inverter bridge 6, ac filter inductive circuit 7, ac filter condenser network 8, AC load switch 9, user load 10, electric current and voltage modulate circuit 11, digital signal processor 12, drive circuit 13, built-in phase place 14, rotating coordinate transformation 15, FFT 16, interior cyclic group wave voltage regulates 17, interior ring harmonic voltage regulates 18, three-dimensional space vectors generator 19, MPPT20, power match judgement 21.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, photovoltaic module 1 produces direct current energy, through being converted to alternating current from net type photovoltaic DC-to-AC converter 2, supplies with user load 3 and uses.For ease of understanding, with the load of Several Typical Load motor representative of consumer.
As shown in Figure 2, the utility model consists of the direct current super capacitor circuit 4, DC support electric capacity 5, inverter bridge 6, ac filter inductive circuit 7, ac filter condenser network 8, AC load switch 9, user load 10, electric current and voltage modulate circuit 11, digital signal processor 12, the drive circuit 13 that connect successively from net type photovoltaic DC-to-AC converter.Wherein, DC support electric capacity 5, inverter bridge 6, ac filter inductive circuit 7, ac filter condenser network 8, AC load switch 9 parts, with existing identical in net type photovoltaic DC-to-AC converter.Be not both, at a DC support electric capacity 5 two ends direct current super capacitor circuit 4 in parallel, if user's bearing power surpasses direct current input power in short-term, by the breach of direct current super capacitor circuit 4 compensation powers, thereby AC voltage, frequency are stablized, and user's load could normal work like this.Electric current and voltage modulate circuit 11, digital signal processor 12, drive circuit 13 are custom circuit.DC support condenser network 4 is greater than the super capacitor of 1 farad by capacitance and forms.
As shown in Figure 3, the course of work of equipment is as follows.
Electric current and voltage modulate circuit 11 collects signal, is sent to digital signal processor 12 and carries out computing, produces control signal, through drive circuit 13 for controlling inverter bridge 6.12 pairs of signals of digital signal processor carry out following processing:
Built-in phase place 14 is as the translation-angle of rotating coordinate transformation 15, and alternating current ifa, ifb, ifc, after rotational coordinates changes 15, obtain ifd, ifq, if0.
Direct voltage Udc, direct current Idc, after MPPT module 20, obtain the maximum power of the current sun, after power match judgement 21, obtain the judgement that can total power input meet user load power (being characterized by ifd) demand.Decision principle is as follows: current sun maximum power and direct current super capacitor circuit power summation, with user load power ratio.As be greater than user load power, continue operation; As be less than user load power, shut down.
Alternating voltage Usa, Usb, Usc, after rotational coordinates changes 15, obtain Usd, Usq, Us0.
Usd, Usq, Us0, through FFT module 16, obtain first-harmonic composition Usd0, Usq0, Us00, harmonic components Usdh, Usqh, Us0h;
Usd0, Usq0, Us00 regulate and obtain Urd0, Urq0, Ur00 through interior cyclic group wave voltage 17.
Usdh, Usqh, Us0h regulate and obtain Urdh, Urqh, Ur0h through interior ring harmonic voltage 18.
Urd0 and Urdh are added and obtain Urd, and Urq0 and Urqh are added and obtain Urq, and Ur00 and Ur0h are added and obtain Ur0.
Urd, Urq, Ur0 obtain final control signal after three-dimensional space vectors generator 19, through drive circuit 13, are used for driving inverter bridge 6.
The utility model adopts after direct current super capacitor circuit, can export instantaneous high-power, thereby starter motor type load.Simultaneously, for some cyclic swing loads, mobile cloud, block the sun etc., the utility model also can well provide the breach between load peak power and sun power, thereby improves the output stability from net type photovoltaic DC-to-AC converter, has widened the scope of application of equipment.
For example, in the petroleum recovering field away from city, it is very high that electrical network is laid cost, and using should be from net photovoltaic DC-to-AC converter, startup, the operation of driving user heavy duty motor that can be stable, and it starts instantaneous power can reach the more than three times of rated value.After the normal work of motor, because of the feature of oil recovery process, load is cyclic swing feature, uses the driving oil production machine that this can be stable from net type photovoltaic DC-to-AC converter to move.
Claims (2)
- One kind be applicable to impact load from net type photovoltaic DC-to-AC converter, comprise the DC support electric capacity (5), inverter bridge (6), ac filter inductive circuit (7), ac filter condenser network (8), the AC load switch (9) that connect successively, it is characterized in that: a direct current super capacitor circuit (4) in parallel at described DC support electric capacity (5) two ends; Also comprise the electric current and voltage modulate circuit (11), digital signal processor (12), the drive circuit (13) that connect successively, the input of electric current and voltage modulate circuit (11) is connected with the input of AC load switch (9), and the output of drive circuit (13) is connected with the control end of inverter bridge (6).
- According to claim 1 be applicable to impact load from net type photovoltaic DC-to-AC converter, it is characterized in that: described DC support condenser network (4) is to be greater than the super capacitor of 1 farad to form by capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420071517.5U CN203722508U (en) | 2014-02-19 | 2014-02-19 | Off-grid photovoltaic inverter suitable for impact loads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420071517.5U CN203722508U (en) | 2014-02-19 | 2014-02-19 | Off-grid photovoltaic inverter suitable for impact loads |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203722508U true CN203722508U (en) | 2014-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420071517.5U Expired - Lifetime CN203722508U (en) | 2014-02-19 | 2014-02-19 | Off-grid photovoltaic inverter suitable for impact loads |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683416A (en) * | 2018-07-25 | 2018-10-19 | 上海艾为电子技术股份有限公司 | A kind of load switch control circuit |
-
2014
- 2014-02-19 CN CN201420071517.5U patent/CN203722508U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683416A (en) * | 2018-07-25 | 2018-10-19 | 上海艾为电子技术股份有限公司 | A kind of load switch control circuit |
| CN108683416B (en) * | 2018-07-25 | 2023-09-15 | 上海艾为电子技术股份有限公司 | Load switch control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221122 Address after: 441000 No. 59, Guanyu Road, Tuanshan Town, Xiangyang High tech Development Zone, Hubei Province Patentee after: Hubei Chasri New Energy Technology Co.,Ltd. Address before: 441003 Hubei city of Xiangfan province high tech Zone, Road No. 1 Patentee before: HUBEI SURPASS SUN ELECTRIC Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 441000 No. 59, Guanyu Road, Tuanshan Town, Xiangyang High tech Development Zone, Hubei Province Patentee after: Borg Warner New Energy (Xiangyang) Co.,Ltd. Address before: 441000 No. 59, Guanyu Road, Tuanshan Town, Xiangyang High tech Development Zone, Hubei Province Patentee before: Hubei Chasri New Energy Technology Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140716 |